Fluid-meter



2 Sheets-Sheet 1.

(No ModeL). J A TILDEN' FLUID METER. No. 457,294. Patented Aug. 4, 1891.

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UNITED STATES PATENT OFFICE.

JAMES A. TILDEN, OF HYDE PARK, MASSACHUSETTS, ASSIGNOR TO HERSEY METERCOMPANY, OF PORTLAND, MAINE.

FLUID-METER.

SPECIFICATION forming part of Letters Patent No. 457,294, dated August1, 1891.

. Application filed March 19. 1888. Serial No. 267,703. (No model.) i

To all whom it may concern.-

Be it known that I, JAMES A. TILDEN, a citizen of the United States, anda resident of Hyde Park, in the county of Norfolk and Commonwealth ofMassachusetts, have invented a new and useful Improvement inFluid-Meters, of which the following is a full, clear, and exactdescription, reference being had to the accompanying drawings, forming apart of this specification, in explaining its nature.

The invention relates to that class of fluidmeters in which there is amovement of the piston in relation to the ring or piece which forms thewall of the piston-chamber; and it relates to various features oforganization and construction, all of which will hereinafter be fullydescribed.

In the drawings, Figure 1 is a horizontal section taken through thepiston and pistonchamber of one embodiment of the invention; and Fig. 2is also a horizontal section representing ameter such as that shown inFig; 1, but when provided with additional ports. Fig. 3 is a verticalsection of a meter having the organization shown in Fig. 1. 7

Referring to the drawings, A represents the lower section of the case ofthe meter, and A the upper section of said case. The upper side of thelatter may serve, if desired, as a support for the case holding theregister. The section A is cylindrical in shape and holds the rotativering or piece 0, which is cylindrical upon its exterior and has thepistonchamber 0. D is the rotary piston within the said chamber 0.

The rotative effect of the piston is of course produced by thedifference in pressure upon the areas submitted to the action of thedirect pressure of the fluid as compared with the pressure upon thedischarge areas, and the rotative effect of the ring or piece .0 is alsoobtained largely from the same cause and partly from the friction of thepiston moving upon it; but the piece 0, having a larger area subjectedto frictional influence than the piston, is retarded in its movement.

, E is the inlet-passage. D is the exhaust passage.

In Fig. 1 I have shown the piston as triangular in form in horizontalsection, having rounded ends and inwardly-curved sides be:

tween the ends, and I have represented the wall forming thepiston-chamber as cylindrical upon its exterior and as having apistonchamber of a shape to permit the rotation of the piston thereinfor the purpose of dividing it into receiving and discharging sectionsby the contact of its surface at two or more divergent points with thewall of the chamber.

These contact-points, while constantly vary-.

in g, are always maintained, so that a complete division of thechamber-into two or more sections is always accomplished. Thisconstruction also depends for its operation upon the movement of thewall or ring which forms the piston-chamber; but instead of forming theinlet and exhaust port in'the bottom plate or diaphragm of the meter Iuse a system of side porting, and this is obtained by enlarging thelower section of the case sufficiently to form the chambersF F betweenthe outer surface of the wall and the inner surface of the case. Thechambers F F are separated from each other by the inwardly-extendingsection or projection f of the case. The chamber F is connected with theinlet-passage and the chamber F with the outlet or exhaust passage. Thepiston wall or ring has framed in it four passages or ports ff f f*,which extend in a straight horizontal line from its outer edge to thepiston-chamber and which are arranged to enter the chamber midway thecenter of the measuring-sections. In operation the piston is caused torotate in the piston-chamber and the ring to be turned also. Thisdivides the piston-chamber into receiving and discharging spaces, whichare alternately brought into communication with the fluid-supply chamberF and the exhaustchamber F, the ring or wall moving to bring each of theports f f f f consecutively in'to connection With the supply and withthe exhaust passages. 1

In Fig. 2 the construction represented is largely like that of Fig. 1,with the exception that the piston has four points instead of three, andthe piston-chamber is correspondingly changed, and the piston therebycaused to act to divide the piston-chamber into more than two measuringspaces or recesses, each of which has its independent port forestablishing connection at the proper interval with the supply passageand with the ex pistcn-chmnber and the ports, the rotary pis- 1o haust.ton adapted to divide the piston-chamber into Having thus fullydescribed. my invention, progressive measuring spaces or recesses, the Iclaim and desire to secure by Letters Patsupply-chamber, and thedistributing-01mm- 5 ent of the United States i ber substantially asdescribed.

The combination, in a. fluid-meter, 01' the JAMES A. TILDEN. case havingthe chambers F F and the in- WVitnesses: weirdly-extending section orprojection f, the F. F. RAYMOND, 2d, ring contained in said case andhaving the E. P. SMALL.

